x d damper for heating units



R. BOLLHEIMER DAMPER FOR HEATING UNITS Jan. l2, 1937.

Filed March 13, 193s 16 hinehafm Bozzhezmer fumi/14 Patented Jan. 12, 1937 'i OFFIQE l 2,067,560 AivrPER FOB. HEATING UNrrs v Rhinehard ollheimer, Fort Laramie, Ohio Application March 13, 1936, serial No. 68,761

` zclaims. (c1. 126-285) 1 This invention relates to new and useful improvements in indirect heating units adapted especially for use between a furnace or stove and the chimney.

Among the several objects of my invention are to provide such a unit with a manually operable valve or damper whereby the hot furnace gases may be either directed into the heater and thereby utilized to heat fresh air, or to permit said gases Yto pass directly from the furnace to the chimney; and to provide such a unit with a damper which is extremely simple in construction, cheap to manufacture, and durable in operation.

With these and other objects in view which will more fully appear, the nature of the invention will be more clearly understood by following the description, the appended claims, and the several views illustrated in the accompanying drawing.

In the drawing: l

Figure 1 is a vertical sectional view of a heating unit embodying the invention,

Figure 2 is a similar view but showing the top removed, and the valve or damper raised, and

Figure 3 is a vertical cross section taken on the line 3 3 of Figure 1.

Like reference numerals designate corresponding parts throughout the several figures of the drawing.

Referring to the accompanying drawing, my indirect air heating unit A is connected between a furnace or stove and a chimney by pipes 5 and 6 whereby the hot furnace gases will pass through the unit A.

'Ihe unit A comprises an upper header X, a lower header Y, and a fresh air heating drum Z disposed intermediate said headers.

The lower header Y which is rectangular in horizontal cross section, forms a base for the unit and consists of a bottom 'I and a wall 8, the latter being formed along its upper edge with a seat 9.

The heating drum Z which is mounted on the seat 9 is also rectangular in horizontal cross section and includes a wall I2, upper and lower heads I3, I il, and a plurality of outlet tubes I5 and return tubes I6 connecting said heads and having open communication with the upper and lower headers X and Y. The wall I2 is provided adjacent the bottom head I4 with fresh air inlet openings I'I and adjacent the top head I3 with heated air outlet openings I8. The outlet tubes I5 are located in one group on one side of the drum, and the return tubes I6 are located in another group on the other side of the drum. The

wall I2 is secured to the lower header Y by screws I9, and the upper edge of the wall forms a seat 20.

The upper header X which is likewise rectangular in cross section includes a wallv 2| which is mounted in the seat 20 and is secured to the wall I2 of the drum Z by screws 22. The wall 2| is 5 formed at opposite points with inlet and outlet openings 23 and 24 respectively to which the pipes 5 and 6 are connected. The outlet tubes I5 are located adjacent the inlet opening 23, and the return tubes I6 are located adjacent the outlet 10 opening 24. The wall 2| is closed by a top or lid 25 which is removably secured to the wall by screws 25a.

Located within the upper header X is an inclined plate valve or damper 26, the upper end l5 being hinged as at 27 to the wall 2l at a point above the inlet opening 23. This valve extends downwardly towards the outlet opening 24 and has its free or lower edge normally resting on the head I3 of the drum Z at a point intermediate the 20 outlet tubes I5 and the return tubes I6. In order to raise the valve 26, I have provided a manual means which is operable from the exterior of the header. This means comprises a rock shaft 28 which extends across the header below the valve g5 or damper and has its ends journaled in the wall 2I thereof. Secured centrally to the rock shaft is a cam arm 29 which has sliding contact with the underface of the damper, and one end of the shaft terminates outside of the wall 2I in a crank 30 handle 30 by means of which the rock shaft may be turned to raise the damper.

A stop 3| is secured to the underface of the damper and cooperates with the cam arm 29 to limit the movement of the latter when the damper 35 is being opened. When the damper is fully opened as shown by dotted lines in Figure 1 the cam arm 29 will be positioned a trifle to the left of the vertical containing the rock shaft 28, and the crank arm 29 will be substantially vertical. 40 Thus, the damper will be retained in its open position until the crank arm is manually returned, when the weight of the damper will cause it to gravitate and remain in its closed position, as shown by full lines in Figure l. 45

From the foregoing, it will be apparent that in normal operation, the hot gases from the furnace will enter the upper header X and will be directed into the outlet tubes I5 by the damper 26. The gases will then enter the lower header Y 50 and then return to the upper header X through the return tubes I6 and then pass into the chimney. At the same time fresh air will enter the drum Z through the inlet opening I'I, then contact the tubes I5, I6 and become heated, and then 55 pass into the room via the outlet openings I8. When it is desired to cut oi the heating drum Z, the damper 26 is raised to its open position at which time the hot gases from the furnace will pass directly through the upper header X from the inlet opening 23 to the discharge opening 24. After considerable use the tubes I5, I6 become more or less clogged with the products of combustion and it becomes necessary to clean the same. The cover or lid 25 is first removed, the damper 26 is swung upwardly to a vertical position so as to obtain access to the tubes l5, and both sets of tubes can then be .cleaned by a brush 32 or other suitable tool, as shown in Figure 2.

It is of course to be understood that the details of structure and arrangement of parts may be variously changed and modified without departing from the spirit and scope of my invention.

I claim: p

1. A damper for controlling passage through a heating duct rectangular in cross` section comprising, a rectangular plate disposed transversely of the duct and proportioned to close said duct whereby to close said duct when lowered at an incline thereacross, means to pivotally support said plate at its upper edge, a crank arm operable from without the duct and freely engageable beneath the plate for'fcontrolling theraising and lowering of 'said plate, and a stop lug depending from said plate intermediate said pivotal support and the position of said crank whereby said crank will engage the stop in the past dead center position.

RHINEHARD BOLLHEIMER.- 

